Indexes. They're one of the most powerful and misunderstood aspects of SQL performance. In this post we'll look at the purpose of an index, how to create and choose choose your index type. Then finish with a discussion of how to decide what to index and
oracle@b2bdev:~$ dbca -silent -createDatabase -responseFile /export/home/oracle/db_create.rsp [WARNING] [DBT-06208] The 'SYS' password entered does not conform to the Oracle recommended standards. CAUSE: a. Oracle recommends that the password entered should be at least 8 characters in lengt...
I am working on exadata project. Right now I am going to upgrade the Database from 11.2.0.2 to 11.2.0.3. My Question: there is Solaris Express 11 Compute nodes. I am connected directly to the Exada using KVM, but I can't see the GUI or desktop of Solaris server. Because I need t...
In Oracle Database 12c Release 1 the concept of multitenant environment has been introduced. The multitenant architecture enables an Oracle database to function as a multitenant container database (CDB) that includes zero, one, or many customer-created pluggable databases (PDBs). A PDB is a p...
create table toys ( toy_name varchar2(10), weight number, colour varchar2(10) ) organization heap;Heaps are good general purpose tables. They are the most common type you'll see in Oracle Database installations.With these, the database is free to store new rows wherever there is s...
You can install it from the Oracle website, but you need to have an account on it to create an account. Install the required version of the Oracle SQL Developer. Install Oracle Database 10g and Sample Schema. Unlock the HR user and log in as the SYS user and type command: alter user...
RunPython(gen_uuid), ] atomic 属性对不支持 DDL 事务的数据库没有影响(例如 MySQL,Oracle)。(MySQL 的 原子性 DDL 语句支持 指向独立的语句,而不是封装在能回滚的事务中的多句语句。)控制迁移顺序¶ Django 不是通过迁移的名字决定迁移执行顺序,而是通过在 迁移 类上使用两个属性: dependencies 和run_...
How to Create a Table in Oracle? Now that we know what exactly a table in Oracle is, we will see how to create a table in the Oracle database. Let us look into the syntax for creating a table in Oracle. Syntax: CREATE TABLE table_name ( ...
Create a MySQL Database Create Tables in MySQL Database Now you need to select the database to work on: use tecmint; Here we will create a table called “minttec” with three fields: CREATE TABLE minttec ( id INT(3), first_name VARCHAR(15), ...
Oracle allows you, with some restrictions, to modify views that involve joins. Consider the following simple view: CREATE VIEW Emp_view AS SELECT Ename, Empno, deptno FROM Emp;This view does not involve a join operation. If you issue the SQL statement: ...